Fatigue-related changes in fascicle-tendon geometry over repeated contractions: Difference between synergist muscles

Naotoshi Mitsukawa, Norihide Sugisaki, Hiroaki Kanehisa, Tetsuo Fukunaga, Yasuo Kawakami

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Fatigue-induced changes in force production of synergist muscles were evaluated through observation of fascicle-tendon geometry and electromyography (EMG). Seven subjects performed 60 maximal isometric plantar flexions intermittently. No statistically significant intermuscle difference was observed in the decrease of mean EMG amplitudes or mean power frequency for the medial gastrocnemius (MG) and soleus (SOL) muscles. The tendon elongation of MG significantly decreased after the 19th contraction, and MG fascicle length increased after the 29th contraction, while SOL fascicle and tendon length did not change except for the last contraction. The declines in torques were highly correlated with the increase of MG fascicle length and decrease in tendon elongation in each subject, while no consistent relationship was found for SOL. These results suggest that changes in force-production of MG and SOL over repeated contractions differ, which is reflected in fascicle-tendon geometry.

Original languageEnglish
Pages (from-to)395-401
Number of pages7
JournalMuscle and Nerve
Volume40
Issue number3
DOIs
Publication statusPublished - 2009 Sep 1

Keywords

  • Electromyography
  • Muscle fatigue
  • Synergist muscle
  • Tendon elongation
  • Ultrasonography

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)

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